A political strategist who worked on Sir Keir Starmer’s campaign has explained how she went to the US to share “lessons learned” with the Democrats following Labour’s election victory.
This week, the Trump campaign accused Labour of illegal interference after the party’s head of operations, Sofia Patel, posted on LinkedIn she was coordinating nearly 100 current and former party officials to campaign in battleground states.
Deborah Mattinson, who also worked with Tony Blair, Gordon Brown and Neil Kinnock, told Beth Rigby on the Electoral Dysfunction podcast she was asked to go to the US in September to talk to Democrats about Labour’s campaign by centrist Democratic thinktank Progressive Policy Institute.
She had already finished working for the Labour Party when she went to the US.
Ms Mattinson was speaking on Tuesday, ahead of the Trump campaign filing a complaint to the US federal electoral commission claiming there had been “interference” in the “form of apparent illegal foreign national contributions made by the Labour Party of the UK”.
It references reports suggesting Labour strategists have been offering advice to Kamala Harris “about how to earn back disaffected voters and run a winning campaign from the centre left”.
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The complaint also mentions a Telegraph report suggesting Morgan McSweeney, Sir Keir’s new chief of staff, and Matthew Doyle, his director of communications, “attended a convention in Chicago and met with Ms Harris’s campaign team”.
Image: Deborah Mattinson has worked with Sir Keir Starmer, Tony Blair, Gordon Brown and Neil Kinnock. File pic: Richard Gardner/Shutterstock
Ms Mattinson, who no longer works for Labour, said following the party’s landslide victory somebody she knew from the Progressive Policy Institute “got in touch with me…and said they would really like me to go over and share lessons learned with some of their colleagues in the Democrats”.
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“I said, ‘fine’,” she added.
She said the thinktank funded that, including focus groups and polling “to understand who their hero voters were”.
“And that was what I did, that was what I took over there and shared with other Democratic organisations, with pollsters, with strategists on their side,” she said.
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Analysis: US election on a knife edge
Ms Mattinson said nobody from her team saw anybody from the Harris campaign, “but we talked to people that are working with them”.
She and those with her went over in September, in the week of the first and only debate between Ms Harris and Mr Trump, “so they were all down in Pennsylvania doing the debate”.
The strategist added the Progressive Policy Institute “was set up to collaborate between like-minded parties around the world, and that’s what they do”.
She said she is worried about what the impact of a Trump victory could be. “I’m worried about what that means for centre left parties around the world.”
Sir Keir has insisted his relationship with Mr Trump has not been jeopardised following the accusations of interference by the former president’s campaign.
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Sky News US election night set revealed
The prime minister said on Tuesday he had “established a good relationship” with Mr Trump and said Labour Party volunteers “have gone over pretty much every election” but “in their spare time”.
The Labour Party has insisted it is not funding the travel or accommodation for activists.
Federal election rules stipulate foreign volunteers cannot spend more than $1,000 (£770) helping candidates.
A Labour Party spokesman said: “It is common practice for campaigners of all political persuasions from around the world to volunteer in US elections.
“Where Labour activists take part, they do so at their own expense, in accordance with the laws and rules.”
Only a quarter of British adults think Sir Keir Starmer will win the next general election, as the party’s climbdown over welfare cuts affects its standing with the public.
A fresh poll by Ipsos, shared with Sky News, also found 63% do not feel confident the government is running the country competently, similar to levels scored by previous Conservative administrations under Boris Johnson and Rishi Sunak in July 2022 and February 2023, respectively.
The survey of 1,080 adults aged 18-75 across Great Britain was conducted online between 27 and 30 June 2025, when Labour began making the first of its concessions, suggesting the party’s turmoil over its own benefits overhaul is partly to blame.
The prime minister was forced into an embarrassing climbdown on Tuesday night over his plans to slash welfare spending, after it became apparent he was in danger of losing the vote owing to a rebellion among his own MPs.
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Govt makes last-minute concession on welfare bill
The bill that was put to MPs for a vote was so watered down that the most controversial element – to tighten the eligibility criteria for personal independence payments (PIP) – was put on hold, pending a review into the assessment process by minister Stephen Timms that is due to report back in the autumn.
The government was forced into a U-turn after Labour MPs signalled publicly and privately that the previous concession made at the weekend to protect existing claimants from the new rules would not be enough.
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While the bill passed its first parliamentary hurdle last night, with a majority of 75, 49 Labour MPs still voted against it – the largest rebellion in a prime minister’s first year in office since 47 MPs voted against Tony Blair’s Lone Parent benefit in 1997, according to Professor Phil Cowley from Queen Mary University.
It left MPs to vote on only one element of the original plan – the cut to Universal Credit (UC) sickness benefits for new claimants from £97 a week to £50 from 2026/7.
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Govt makes last-minute concession on welfare bill
An amendment brought by Labour MP Rachael Maskell, which aimed to prevent the bill progressing to the next stage, was defeated but 44 Labour MPs voted for it.
The incident has raised questions about Sir Keir’s authority just a year after the general election delivered him the first Labour landslide victory in decades.
And on Wednesday, Downing Street insisted Rachel Reeves, the chancellor, was “not going anywhere” after her tearful appearance in the House of Commons during prime minister’s questions sparked speculation about her political future.
The Ipsos poll also found that two-thirds of British adults are not confident Labour has the right plans to change the way the benefits system works in the UK, including nearly half of 2024 Labour voters.
Keiran Pedley, director of UK Politics at Ipsos, said: “Labour rows over welfare reform haven’t just harmed the public’s view on whether they can make the right changes in that policy area, they are raising wider questions about their ability to govern too.
“The public is starting to doubt Labour’s ability to govern competently and seriously at the same levels they did with Boris Johnson and Rishi Sunak’s governments. Labour will hope that this government doesn’t end up going the same way.”
Image: Chancellor of the Exchequer Rachel Reeves (right) crying as Prime Minister Sir Keir Starmer speaks. Pic: Commons/UK Parliament/PA
It is hard to know for sure right now what was going on behind the scenes, the reasons – predictable or otherwise – why she appeared to be emotional, but it was noticeable and it was difficult to watch.
Her spokesperson says it was a personal matter that they will not be getting into.
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Even Kemi Badenoch, not usually the most nimble PMQs performer, singled her out. “She looks absolutely miserable,” she said.
Anyone wondering if Kemi Badenoch can kick a dog when it’s down has their answer today.
The Tory leader asked the PM if he could guarantee his chancellor’s future: he could not. “She has delivered, and we are grateful for it,” Sir Keir said, almost sounding like he was speaking in the past tense.
Image: Rachel Reeves looked visibly upset behind Keir Starmer at PMQs. Pic PA
It is important to say: Rachel Reeves’s face during one PMQs session is not enough to tell us everything, or even anything, we need to know.
But given the government has just faced its most bruising week yet, it was hard not to speculate. The prime minister’s spokesperson has said since PMQs that the chancellor has not offered her resignation and is not going anywhere.
But Rachel Reeves has surely seen an omen of the impossible decisions ahead.
How will she plug the estimated £5.5bn hole left by the welfare climbdown in the nation’s finances? Will she need to tweak her iron clad fiscal rules? Will she come back for more tax rises? What message does all of this send to the markets?
If a picture tells us a thousand words, Rachel Reeves’s face will surely be blazoned on the front pages tomorrow as a warning that no U-turn goes unpunished.
With the US president’s ties to his family-backed business, World Liberty Financial, and a memecoin launch, Donald Trump has seen his personal wealth increase by millions in 2025.